We study the electronic states and the superconductivity in the two-dimensional 16-band d-p model coupled with A1g, B1g, and Eg local phonons and obtain the rich phase diagram including the magnetic-, charge-, and orbital-ordered phases on the parameter plane of the Coulomb and electron-phonon interactions. When the electron-phonon interaction is dominant, the charge fluctuations induce the s++ -wave superconductivity, while when the Coulomb interaction is dominant, the magnetic fluctuations induce the s± -wave superconductivity. Remarkably, the orbital fluctuations are enhanced due to the cooperative effects of the Coulomb and electron-phonon interactions and induce the s++ -wave and the nodal s± -wave superconductivities.
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|Publication status||Published - 2010 Aug 24|
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics